Telescope-level.



fitentefi may 18,1909.

p aywi -nemnienino, OF 121m, GERIvIJQNQ,

N0. 921,?3. Specific-a I: of Letters Patent. IEitent ed May 113 199$.

ngiplioaiion filed September 22, 153 08 Serial No. fi i vlfii.

To all whom it may ceince 'w:

Be itknow'n that'l, l'iEiNRICH @3212, a citizen of the German l ltiipii'e, and residing I at CMLZeiss slxx'asse, Jenn. in 'ibl'ze GrandDuchy-oi uexellleimar, Germany have in- E vented a new and usefulTelescope-level, oi"

which the following is a speoifiostion. I

lhe invention consists in :1 leveling instmment, the sighting telescopeof which sour-f ielesvope situated 01 the side oi the olsjecfrom {he andhe O'pililfa'hl (is ineen' the lvro nine-rt he shout half the l'mgiih oithe objective. F inee the ohsvz m in. I not encroach noon Lhe s l betmxii the objective oral h-i 'l 3 osen oo'ulwf' must he env o n 'Lhe snz-smeni.

in. the range of such insflmients,

10 tains amongits constituent parts a ("atoptiic more does not 1' "q one:i fine mijust plummet forme eithei' by a vertical mirror 01 by ahorizon gal TDIZX'OI' together with an as 1 inch as the somewhat inclineplane relsi ol? to ins; from I pliine, wit the heel optical square.

The terms vertical. niirroi and hoi'i- 1a Zontal mirror should heUIlilBlSijOOLi to inelude, in addition to solid plane niiiz'ors whichare suspended so as to secure t v i'tioel or horizontal position, em

1 no mirrors which are connected level so that according to i i ice.

the latter they eon oi eieli i iii it in one direction; hon

'izoniol i'aiiiror 1 also fleeting; fluid emeiigqeai 952515 2. 1"

iii the French spesific i. eling instrument is Show which sightingtelescope, For and an ootical square 30 in such a manner, that tiimmediately in fI'Ol'lt of t of the objective and iithe the horizontalmirror. Th i V mirror from the objective Through this arrangement e11 isproi'luoed, in the l L sismnce of the horizo real in'iag e'fiom in HSl'llfliiSi focal. p* v 46 The diilerenee he? n ti instrument and the n iaccording to thepresem 1 *en not merely a Cliii'erence in theai-i'angelnent FUl n he c-os'ipemtion of the i you main pm s sighizingtelescope. Z'lZC'H iTfli mirror and op 1* 19C in t tic-e1, square 1 161111.1!01", Wh'ch may he sunniblv U l: he

tial constituent part, of the 50 in much as it tzzinsfers 3 1 real imageof the object wojeoseil h; the objective into the field of time sightinglink. The sighfiing insrlc, however, is in 1e 1 esent :11-

ranged on Oi 11 11 ihe (ll-3180151 76 sol on or nee: its snis. Themirror Inns; izheizhore he hting telescope, 8 An ion hethe sight oculzirc in oerioi.

cemented on the objective and presents a simple reflection which, incombination with the reflection through I), nullifies the erection ofthe image caused by the reversed )osition of the observer, while tomaintain the erection of the image caused by the ocular lenses,

.the prism It is constructed as an optical the one-hand i'orms thecarrier for the linear sighting mark d which intersects the axis of theobjective, and on the other carries in its inclined juncture a silverlayer a, which forms the entrance mirror of the ocular sim ply broken bythis device. The ocular lenses 0, p, g and'r represent in this case alsoan ordinary terrestrial ocular, so that the observer views an erectedimage. Inorder to enable the image of the object to be brought exactlyinto the field. of the sighting mark, the objectivetogether with theocular is made adjustable in height by the rack and pinion s t u. Theglass cover a of the mercury chamberis a Wedge-formed disk. By rotatingthis wedge a possibledeviation of the angle of deflection of the opticalsquare prism 11 from can be compensated for as well as an extra-axialposition of the sighting mark in such a manner, that the image of theobject point in the horizontal plane nevertheless falls in the sightingmark (2. For the azimuthal rotation of the instrument its main casing wis pivoted on a tripod ac.

I claim? 001181817111 of an objective, a catoptrie plum- 'met, asighting mark in proximity to th objective anda broken ocular.

2. In a telescope level a sighting telescope consisting of an objective,an optical square,

a horizontal mirror, a sighting mark in prox-. imity to the objectiveand a broken ocular,

the mirror lying on the side of the objective remote from the object andthe optical (11$- 1. In. a telescope level a sighting telescope tancebetween the objective'and the horizontal mirror being length of theobjectlve.

about half the focal '3'. In a telescope level a sighting telescopeconsistin of an objective, the axis of which is vertica an opticalsquare above the objectlve, a horizontal mirror below' the objective ata distance from It about equal to half its focal length, a sighting markin roximity'to the objective and a broken ocu ar.

HEINRICH WILD Witnesses:

PAUL KRI'JGER,

FRITZ SANDER.

